铜炉渣活性激发实验研究及水化机理分析

来源期刊:中南大学学报(自然科学版)2017年第9期

论文作者:吴爱祥 姜关照 兰文涛 刘娟红 薛杨

文章页码:2498 - 2506

关键词:铜炉渣;机械活化;碱激发;充填胶凝剂;水化机理

Key words:copper slag; mechanical activation; alkali activation; filling gelling agent; hydration mechanism

摘    要:为了实现铜炉渣的回收利用,通过机械活化和碱激发的方式制备铜炉渣胶凝材料,并利用X线衍射(XRD)、扫描电镜(SEM)、能谱仪(EDS)和矿渣玻璃体分相结构模型对铜炉渣水化机理进行分析。研究结果表明:当比表面积为520 m2/kg时,铜炉渣净浆试样的7 d和28 d强度分别达到2.4 MPa和3.3 MPa;当灰砂比为1:1时,铜炉渣全尾砂充填料的7 d和28 d强度分别达到0.7 MPa和1.0 MPa,满足当地矿山充填的要求。水化初期,炉渣玻璃体中的富钙相和高钙石灰共同水化生成了Ca(OH)2,其进一步与富硅相反应生成C-S-H凝胶等水化产物。随着水化反应的继续进行,试样内部的孔隙逐渐被水化产物填充并缩小至孔状,浆体结构更加致密。

Abstract: In order to realize the recycling of copper slag, copper slag cementitious material was prepared by the way of mechanical activation and alkali activation, and the hydration mechanism of copper slag was analyzed by XRD, SEM, EDS and slag vitreous phase structure model. The results show that when the specific surface area of slag is 520 m2/kg, 7 d strength and 28 d strength of copper slag paste specimen reach 2.4 MPa and 3.3 MPa, respectively. When cement sand ratio is 1:1, 7 d and 28 d strength of copper slag tailings filling reach 0.7 MPa and 1.0 MPa, respectively, meeting the requirements of local mine filling. In the early stage of hydration, the calcium-rich phase and high calcium lime generates calcium hydroxide, which further forms C-S-H gel and other hydration products with silicon-rich phase. As the hydration reaction continues, the internal pores of sample are filled with hydration products and gradually shrink into hole type, and the structure becomes denser.

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